Chaoshan dialect was the official language of which dynasty?

I can't say yes, I can only say that some tones and structures of ancient Chinese have been preserved. Since the Three Kingdoms, northern China has experienced five wars, namely, China Rebellion, Southern and Northern Dynasties, Jin invasion of Song Dynasty, and Yuan destruction of Song Dynasty. Most residents in the north moved to the south and merged with the local aborigines. Minnan dialect is also related to integration of language, the local She nationality, so the current dialect can't be said to be ancient Chinese.

I have read the literature before, and the population of Chaoshan area grew rapidly during the Tang and Song Dynasties. It is estimated that Chaoshan dialect, that is, Minnan dialect, should be close to the northern mandarin of Tang and Song Dynasties.